dave5237
08-13-2011, 12:49 PM
Hi guys. Here's a easy one for you guys. Hooking up my fuel pump ( mechanical pump ) two fuel lines under hood. One's a 1/4 line and one's a 3/16 diameter line. Which line is the supply and wich one is the vent back. I could trace it out but what a pain. I would think the vent would be larger so it vents properly. I started filling the tank hoping it would drain out its lower point but no gas yet. I know one line ( possibly smaller one ) goes to the vapor evaporator. Your help please.
Cranky
08-13-2011, 01:23 PM
What is this on? Generally, the smaller line is the return....
dave5237
08-13-2011, 01:39 PM
sorry 440 engine 1968 gtx
Revhendo
08-13-2011, 02:26 PM
Did you mean 5/16th? That would be the feed line to the pump. The 1/4 is going to be the vent. (?) (Did they use return lines in 68? I honestly don't know).
Slantsixdan
08-13-2011, 02:35 PM
5/16" is the supply line. 1/4" is the vapour return line.
dave5237
08-13-2011, 05:03 PM
yeah i made a mistake. i said 3/16. It looks like 5/16 is the fuel line ( the bigger line) and the 1/4 line is the vent line ( small line ). if you measure the outlet into the pump it measures 5/16. if you measure the line off of the vapor seperator it is 1/4. thanks guys. if you dont agree let me know.
Patrick
08-13-2011, 05:16 PM
Hi guys. Here's a easy one for you guys. Hooking up my fuel pump ( mechanical pump ) two fuel lines under hood. One's a 1/4 line and one's a 3/16 diameter line. Which line is the supply and wich one is the vent back. I could trace it out but what a pain. I would think the vent would be larger so it vents properly. I started filling the tank hoping it would drain out its lower point but no gas yet. I know one line ( possibly smaller one ) goes to the vapor evaporator. Your help please.
The big line is the supply line.
